Michael Rubens Bloomberg (born February 14, 1942) is an American businessman, politician, author, and philanthropist. As of November 2019, his net worth was estimated at $58 billion, making him the 9th richest person in the United States and the 14th richest person in the world. He has joined The Giving Pledge, whereby billionaires pledge to give away at least half of their wealth. To date, Bloomberg has given away $8. 2 billion, including his November 2018 $1. 8 billion gift to Johns Hopkins University for student aid—the largest private donation ever made to a higher education institution.